Agreed. I have MSFS at the moment on a 4 TB HDD. Approaching large airports I always get a slight stutter on approach as the sim loads all the airport scenery, AI / Live traffic, etc. You can see this happening in real time if you have task manager open on the performance tab. You’ll see the disk activity on the HDD at 100%. Better yet is the Disk tab in Resource Monitor. It shows the disk queue length. When it gets above 5, you’ll probably see the stuttering start. You’ll also see exactly what is being read from your HDD in the disk activity pane.